Artificial hand



'H. G. KNOBEL.

vARTIFICIAL HAND. APffLlcATloN lLED MAR. 25, 1922.

Patented Aug. 22, 1922.

2 SHEETS-SHEET 1.

miv/VE se es,

H. G. KNOBEL.

ARTIFICIAL HAND.

APPLICATION man MAR.25. 1922.

1,426,481. ,mmm-gm, 1922',-

2 shura-SHEET 2.

HENRY e. Kiiioisriii,y ori-,NEW GANAAN; eoivivncricucr.

ARTIFICIAL HAND. 1

To all 'whom it may concern.' i l Be it known that I, HENRY, CT. KNoBnL,

a citizen of the United States, residing at' New Canaan, in the county of F aireld andl State of Connecticut, have invented certain new and useful Improvements in an Artificial Hand, of which the following` is a specification.

The present invention generically relates to artificial body-members and more specifically it comprehends an improved construction of mechanical hand, .designed to firmly grasp various objects, and otherwise replace, in so far as possible, the manifold functions of the amputated member.

Another important object of the invention is to generally improve upon rartificial hands of this nature by providing a device which will be extremely simple, and efficient, inexpensive to manufacture, reliable in operation and well adapted to the purpose for .which it is designed.

Another important object of the invention is to provide a hand rotatable in relation to its support and means for locking the same against rotation when so desired.

With the above and numerous other objects in view, as will appear as the description progresses, the invention resides in certain novel features of construction, and the combination and arrangement of parts as will be hereinafter more fully described and claimed.

In the drawing Figure 1 is a top plan of the artificial hand embodying my invention,

Figure 2 is a side elevation thereof, a portion being shown in section,

Figure 3 is a perspective thereof,

`Figure 4: is a perspective of the body of thev hand,

Figure 5 is a perspective of the thumb claw,

Figure 6 is a perspective showing the washers used in conjunction with the device, and

Figure 7 is a perspective of the wrist plate showing the same attached to the arm socket.

Referring to the drawing in detail it will be seen that the arm socket 1 is adapted to receive the forearm and to be laced thereon and as this socket does not form part of my improvement it is to be understood that any desired structure may be used. A plate 2 is disposed at the end of the socket specification@ Lettei-sjiieten. j Paten-ted Aug; 122,.'1922;

Application ined Maranza 1922. seriai Normans. f i V j1 and acts as afwasher between the wrist member 8 .andthe socket 1. Thisnwrist ineinberBv is rmly held in place preferably by plurality of screws 4.l .The wrist member is' provided with a longitudinally` extending threaded bore 5 which receives the threaded pin or bolt` 6.. is substantially T-sliape and its shank-8 is provided `with a threaded bore 9 for receiving the end ofthe bolt4 Gand the three VThe body -f/ washers 10 and 11 areA disposed between the shank 8 and the wrist meinber`3 it being note-d that the washer 11 is preferably formed of rubber or some such elastic material. The head 12 of they body 7 has a reduced v'threaded extension 13' at one yendV tends from the head parallel with and adjacent to the shank 8 so as to terminate in an enlargement 19 whicliis recessed on its bottom face. A headed pin 20 projects into the recess and terminates in a bolt 21 adapted to rest in one of the indentures 22 arranged about the end of the wrist member 3. A spring is situated in the recess for pressing the bolt in these indentures 22. f

lso

This structure prevents accidental rotation v of the body 7 in relation to the wrist 3. l

Each of the cla-ws 14- and 16 terminate in .flat end members 25 which have rounded edges thus allowing these claws to grasp effectively a large number of articles of different construction and minimizing at the same time the danger of injuring said articles.

Although I have described my kinvention with some degree of particularity, it is to Having thus described my inventip'on what I claim as new is i 1. An artificial hand comprising a wrist member, a body member comprising finger claws mounted rotatably on the Wrist member, an arm extending `from the member toward the Wrist member and terminating adjacent thereto, a spring pressed plunger carried in the terminal of the arm, said Wrist member provided with a piurality of indentures for receiving said plungers.

2. An artificial hand of the class described comprising in combination a Wrist having a threaded bore therein, a threaded bolt having one end received in said threaded bore, a body member having a threaded bore for receiving the other 'end oi said bolt, a plurality of iixed curved finger claws on the body member, a reduced extension provided with threads mounted on the end of said body portion, a thumb claw curved throughout its length in an opposite direction from said claw fingers rotatably mounted on said extension and a Wing nut on the extension for looking the thumbv claw against rotation When desired.

3. An artiicial hand of the class described comprising in combination a Wrist having a threaded bore therein, a threaded bolt having one end received in said threaded bore,

a body member having a threaded bore-for receiving the other end of said bolt, a plurality of iXed curved finger claws on the body member,v a reduced extension provided With threads mounted on the end of said body portion, a thumb elavv curved throughout its length in an opposite direction from said claw fingers rotatably mounted on said extension and a Wing nut on the extension for locking the 'thumb cla-W against rotation when desired and an arm fixed to the body portion and extending to- Ward the Wrist portion terminating adjacent thereto in a recessed enlargement, a spring pressed bolt mounted in said recessed enlargement, said Wrist portion provided With a series of apertures for receiving said spring pressed boltl whereby the body portion may be locked against rotation in relation to the Wrist portion.

In testimony whereof l arTiX my signature in presence of two Witnesses.

HENRY G. KNOBEL. Witnesses:

A. D. BURDICK, BERNARD F. GETTA. 

